Apparatus for treating metal articles



Feb. 9, 1943.A R, F; ARNLDY 2,310,384

AT PARATUS FOR TREATING METAL ARTICLES Filed Aug. 2, 1940 3 Sheets-Sheet1 ROMA F. ARNOLDY BY l ATTORNEY F6119, 1943. y Rl F ARNO'LDY A 2,310,384

APPARATUS FOR TREATING METAL ARTICLES Filed Aug. 2, 1940 s sheets-sheet2 lo /0 5 66 l I4' Z 65 62 O .fo ff s A A i f 1 5 50 /5 /5 "67 g 7a yROMAN F. ARNOLDY BY LE1-LWNM-,

ATTORNEY Feb. 9, 1943.

R. F. ARNoLDY APPARATUS FOR TREATING METAL ARTICLES vFiled Aug. 2, 1940MW M I5 Sheets-Sheet 3 INVENTOR ROMAN E ARNOLDY ATTORNEY insufficient.

Patented Feb. 9, 1943 amarsi APPARATUS ron rename. METAL ARTICLES RomanF. Arnoldy, Houston, Tex., assignor to The Linde Air Products Company, acorporation of Ohio Application August 2, 1940, Serial No. 349,456 IClaims.

This invention relates to the treatment of elongated metal articles, andto the hardening of surface portions thereof by the applic-ation of hightemperaturev heat, preferably followed by the application of a suitablecooling medium; and more particularly to apparatus for flame hardeningcylindrical surfaces of elongated metal articles,

instances in whichy other sources ofhigh temperature heat are utilized.

such as the interior or exterior surfaces of tubes,

To provide a greater resistance to wear and abrasion, it is oftendesirable to produce on a metal article a surface portion or case havinga greater hardness than the remainder of the article, since theunhardened portion remains tough and ductile whereas if the entirearticle were hardened the resultant ductility would be An extremelye'ective method of producing such a surface' portion or case has beenfound to be name hardening, in which 'high Vtemperature heating flames,such as those produced by the combustion of a mixture `of oxygen andacetylene, or other suitable gases, are applied to a surface in order toheat the metal to a desired depthl and to a temperature at or above thecritical range, after which the heated metal is cooled rapidly toproduce a hardened structure. In some instances, the entire surfaceportion is heated and then cooled, while in other instances successiveportions are heated and cooled in a progressive manner. 'I'he principlesof this invention have their greatest applicability to the latter orprogressive method.

Furthermore, a variety of cooling 'methods have been employed. Airhardening steel, for instance, will harden upon natural cooling, andthesurface portion to be hardened need only be heated;

It is not only desirable but also necessary in most applications ofsurface or flame hardening to produce a uniform hardness, both laterallyor circumferentially and also-longitudinally of a surface or portionthereof. A shaft or rod for moving the piston of a reciprocatingcompressor, for instance, must have a. uniform hardnesslongitudina11y,.or unequal wear will occur which will cause the shaftnot only to rock in its bearings, but also cause leakage past thepacking; and the rod also must have a uniform circumferential hardness,or unequal wear will cause packing leaks at various circumferentialpoints; Similarly, a tubular linerfor the cylinder of a pump orcompressor,` for instance, must be provided, must be provided with aninner surface having a uniform hardness both circumferentially andlongitudinally, or unequal wear from the piston travelling thereoverwill result in grooves or depressions at which the rings ordi-A narilyemployed will be unable to prevent leakage.

A cylindrical surface of a metal article may be hardened by applyinghigh temperature heat to successive circumferential zones thereof, andeffecting a relative rotational movement as well as a relativelongitudinal movement between the surface to be hardened and the sourceof heat. Apparatus for flame hardening a cylindrical surface of a metalarticle in this manner may include a carriage movable upwardly anddownwardly along a vertical framework. In name hardening an exteriorcylindrical surface of a metal article such as a shaft, the article ismounted for rotation in a vertical position, and

while the usual rail steel normally requires only the application of anair quench to produce sufilcient cooling for hardening. However, thegreat majority of metals require the application of a water or similarquench to effect the sudden or rapid cooling necessary to produce thedesired hardness, andthis invention will be explained with reference tosuch cooling, although it will be understood that other methods ofcooling may be employed Where the nature of the metal or otherconsiderations indicate that such other methods are desirable.

. In addition, heating has been accomplished by means other than high.temperature heating' flames, such as by electric arcs, and while thisinvention is to be explained with reference to lheating flames, it willbe understood that the principles of this invention may be applied to aheating and quenching device, which directs a plurality of heatingflames inwardly against a circumferential zone of the surface of theshaft and a plurality of quenching jets beneath the heating flames, ismounted on the carriage, which is moved upwardly. In name hardening aninterior cylindrical surface` of a pump liner or the like, the articleto be treated is mounted for. rotation on the carriage and moveddownwardly past a stationary heating and quenching device. While suchapparatus is eminently satisfactory for llame hardening relatively shortshafts, cylinders, rolls, tubes, pump liners, and the like, the lengthof article which can be treated is limited by the height of theframework and also by the relation between length and diameter, which-in many instances is sutilciently great so that the article lackssuflicient stiffness to be supported between centers or from beneath.Furthermore, with previous quenching devices, it is difficult to directthe quenching jets against the heated surface as close to the heatingflames as is often desirable.

Among the objects of this invention are to provide novel apparatus fortreating a cylindrical surface of a relatively long metal article, suchas a shaft, tube, or the like, and particularly an article of suchlength that it cannot be supported between centers or from beneath; toprovide such apparatus in which relative rotational and longitudinalmovements between the article and a treating device are effected; toprovide apparatus by which such an article is simultaneously rotated andmoved downwardly with respect to a heating and quenching device, and thearticle is accurately guided during such movement; to provide a novelquenching device by which quenching jets may be directed against theheated surface portions at points more closely adjacent the heatingiiames, but without interfering with the operation of the heatingflames; and to provide such apparatus which is economical to manufactureand relatively easy to operate.

Other objects and novel features of this invention will become apparentfrom the following description and accompanying drawings, in which:

Fig. 1 is a front elevation of apparatus constructed in accordance withthis invention, by which a relatively long shaft is being treated;

Fig. 2 is a horizontal sectional view taken along line 2-2 of Fig. 1,looking downwardly on a heating and quenching device which forms a partof the apparatus of Fig. 1;

Fig. 3 is a partial horizontal sectional view taken along line 3-3 ofFig. 1, looking downwardly on a special guiding and rotating devicewhich forms a part of the apparatus of Fig. 1;

Fig. 4 is an enlarged vertical sectional view, taken along line 4-4 ofFig. 3, through the special guiding and rotating device;

Fig. 5 is an enlarged vertical sectional viewl taken along line 5-5 ofFig. 2, through the heating and quenching device;

Fig. 6 is a bottom view of a drive collar which forms a part of thespecial rotating and guiding device; and

Fig. 'l is a top view of an assembly which also forms a part of thespecial rotating and guiding device and which includes a raceway for thedrive collar of Fig. 6 and a guiding bushing for the shaft beingtreated.

In accordance with this invention, a cylindrical surface of an elongatedmetal article is treated by suspending the article from the upper endvso that the axis of the cylindrical surface is disposed substantiallyvertically and so that the article is relatively freely rotatable,rotating the article about the axis of the cylindrical surface,effecting a relative movement in a vertical direction between therotating article and a treating device adapted to treat a limitedvertical portion or a circumferential zone of the cylindrical surface,and restraining the lateral movement of the article at points arelatively short distance apartone point preferably being located. abovethe treating device and the other point preferably being located belowthe treating device. When all or a portion of the cylindrical surface isto be hardened, the treating device is preferably a stationary heatingand quenching device'adapted to heat and cool adjoining circumferentialzones of the surface, and the suspended article is lowered through orpast the treating device.

Apparatus constructed in accordance with this invention may comprise, asin Fig. l, a vertical framework F carrying near its upper end a heatingand quenching device D and a special rotating and guiding device R abovethe heating and quenching device D. A shaft S, the peripheral surface ofwhich is to be flame hardened, is suspended from above by a cable C,which is lowered or raised by a variable speed reversible motor M, theshaft being rotated by a drive collar L which is ldriven from a motor M.Each of motors M and M is preferably mounted atop the framework F,although either motor, and particularly motor M, may be mounted in otherpositions. Also, any other suitable power source may be substituted foreither of motors M or M.

Cable C passes over a pulley P, which is preferably suspended from theceiling of the room in which the apparatus is installed, although pulleyP may be supported by a suitable column, either extending from orseparate from, framework F. Of course, shaft S may be suspended andlowered at a controllable rate in any other equivalent suitable manner,many of which will suggest themselves to those skilled in the art.

As shaft S is lowered, successive circumferential surface portionsthereof are heated and cooled by the heating flames and quenching jetsdirected thereagainst by heating and quenching device D, and as thetreatment progresses the shaftl enters, and is lowered into, a well Wprovided for the purpose. The depth of well W is preferably such thatthe greatest length of shaft expected to be treated can be accommodated.The cooling medium flowing downwardly from the heating and quenchingdevice and along shaft S is collected in a tank T, although a portion ofthe cooling medium will fall into well W. If desired, the framework Fmay be higher, or may be supported on a suitable elevating platform, inwhich case it will be unnecessary to provide a well.

The' framework F comprises four upright stanchions or columns I,disposed, as in Fig. 2, at the four corners of a rectangle. A plate IIconnects the upper end of each pair of columns l0 at the right and left,respectively. A channel or beam I2, disposed centrally of the framework,is supported by plates Ii, and motor M and rotating and guiding device Rare mounted on channel I2. Motor M, as illustrated, is mounted on abracket I3 secured vto the framework at the upper end of the right rearcolumn I0, as in Fig. 1. Heating and quenching device D is mounted on aplatform suspended from a pair of oppositely disposed plates I4, as inFigs. 1 and 2. Each of plates I4 is provided with a pair of collars I5which surround columns yI0 and extend a sui.

cient distance upwardly and downwardly from plates I4 to prevent anyopportunity for misalignment. Collars I5 rest on adjustable collars I6,by means of which the heating and quenching device may be placed in anydesired vertical position. although the normally desired position of theheating and quenching device will be such that collars I5 abut the upperends of columns I0, as in Fig. 1.

Cable C is wound on, and the Xed end thereof attached to, a drum 20which is driven by variable speed motor M, which may be a relativelyslow speed motor or may be provided with an integral speed reducer. Toprevent rotation of cable C vertical alignment with upper guide bushing4i. i

as shaft S rotates, the cable is provided with a swivel joint 2i nearthe opposite, or normally free, end. To permit the shaft S to be rotatedby device R when the upper end of the shaft has reached the heating andquenching device, a short section or dummy shaft 22 is interposedbetween the upper end of shaft S and cable C. The upper end of shaft Smay be drilled and tapped, as shown, so that dummy shaft 22 may beattached thereto.

Drive collar L, of rotating and guiding device R, is driven from motor Mthrough a belt 24 which passes-around the drive collar and a pulley 25.Pulley 25 is mounted on the low-speed shaft of a speed reducer 26, whichis mounted on a vertical bracket 21 secured to one side of channel I2and the high speed shaft of which is coupled ed, and a compressionspring 34,7bearing against the outer end of each plunger, presses therollers into engagement with shaft S. The opposite end of each spring 34bears against a plug 35 which threadedly engages the outer ends of holes3l, and each plunger is provided with a slot 36 which cooperates withthe lower end of a set screw 31 to prevent the plunger from turningwithin the hole. Also, the outer end of each slot 36 acts as a stop orshoulder which engages set screw 31 to limit the distance vinwardlywhich each plunger and roller can move when the apparatus is idle.

Block 30 is also provided on its lower side with an annular bearinggroove 38 which ts over an l annular bearing ring 39, secured to a baseplate 40, whicliin turn is bolted to or otherwise secured to channel I2.Since shaft S is moved downwardly, although relatively slowly, duringthe time that drive collar L is rotating, the vertical force exerteddownwardly on the drive collar keeps block 30 pushed down on ring 39.Also, since shaft S is freely suspended, very little force is requiredto turn the same, and there is little tendency for drive collar L4 to betwisted out of a horizontal plane due to the pull of belt 24. It will beunderstood, of course, that other types of bearings, such as ball orroller bearing assemblies, ma'y be used in lieu of the bearing providedby groove 38 and ring 39.

'I'o insure maintenance of shaft S in accurate alignment, an upper guidebushing 4I is secured in a central aperture in base plate 40, in exactvertical alignment with drive collar L. The web 0f channel I2 isprovided with a hole 42 through which shaft S passes. Bushing 4I ismachined accurately to fit shaft S, and it is necessary to replace thebushing whenever a shaft having a different diameter is to be treated.The construction of drive collar L is such that it will accommodate asubstantial variation in the diameter of shafts to be treated.

As will be evident, vertical rollers 33 rotate as the shaft S movesdownwardly, but force the shaft to rotate about its vertical axis alongwith the drive collar L. At the same time, guide bushing 4| keeps theshaft accurately centered at a point only a short distance above theheating and quenching device D, which, as in Fig. 5, includes aplurality of blowpipe heads provided with removable tips 46, aring-shaped quenching block 41, anda lower guide bushing 48 in exactheating names will now through the The relatively short distance betweenthe upper and lower guide bushings obviates the possibility of 'anymisalignment and consequent distortion, while the quenching .liquidflowing downwardly over the lower guide bushing minimizes thepossibility of its expanding and the shaft thereby running too looselytherein.

Each of the blowpipe headsis similar in construction and is adapted tobe used in treating shafts of a varietyof diameters, being provided withtwo rows of outlets in .which tips 46 of removable plugs 49 may :beinserted. For a shaft having a diameter as illustrated, the upper row ofoutlets in each head is blocked off, but in treating a shaft having agreater diameter, an appropriate number of plugs are replaced by tips.Also, any other number of heads, instead of the four heads shown in Fig.2, may be utilized.

It will be obvious that by using separate blowpipe heads and quenchingblocks, the same blowpipe heads may be used for a wide variety of sizesof metal articles, with only an occasional change in tips necessary toprovide equipment for hardening new or different sizes. heads andseveralsizes of tips can be carried in stock, ya new quenching block only beingmade after it has been determined that a new or differs ent size is` tobe hardened, the cost of new equipment as well as the time necessary toput such equipment in operation is thereby reduced.

The ring-shaped quenching block 41 is hollow and provided with anupwardly extending section 50 on the inner side thereof which permitsthe vquenching liquid to be directed against the heated surface portions.closely adjacent tips 46v from which the heating flames are directedclamped between upper and lower annular plates I or rings 52 and 53,respectively, the forward end of each blowpipe headv resting on thequench block and the rear end of each head resting on a shim block 54.This assembly is secured 'by bolts 55' to a base plate 56, which isprovided with a central aperture in which lower-.guide bushing 48 issecured. Spacing rings I51 are placed about bolts 55 beneath the lowerring 53 toA space the assembly from 4bushing 48, and also to permit-airfor secondary combustion of the heating llames to pass between lowerring-r 53 and base plate 56 and thence upwardly around the shaft, this4current of air being induced by the flow of heated` gases upwardly fromthe heating flames. In addition, some air for secondary combustion ofthe space between the blowpipe heads.

'Each of the blowpipe heads is supplied withacombustible mixture ofgases by a tube 60, and quench block 41 is supplied with a f suitablequenching liquid by tubes 6I. Also, each of the blowpipe heads is cooledby a cooling medium circulated therethrough, the cooling medium vibeinglsupplied by tubes 62 and discharged through tubes 63, the latter ofwhich are bent downwardly as shown so that the discharged cooling mediumwill be collected in tank T of Fig. 1.

Since blowpipe Referring now to Fig. 2, the platform upon which theheating and quenching device D is mounted comprises a pair of supportingplates 65 which are spaced apart to clear bolts 55 of Fig. 5, and topermit various sizes of assemblies which in-clude the blowpipe heads andquench block to be mounted thereon. As shown, base plate 5G is bolted tosupporting plates 65.

The heating and quenching device D also includes a .pair of -blow pipesB and a pair of cooling medium headers 66. Blowpipes B are mounted onbrackets 61 attached to supporting plates 65, and deliver a combustiblemixture of gases to headers 68 from which tubes 60 convey thecombustible mixture to heads 45 of Fig. 5. Blowpipes Bare constructed inthe conventional manner, being provided with valves 69 for regulatingthe flow, to a mixer installed Within the body of each blowpipe, of acombustible gas, such as acetylene, and a combustion-supporting gas,such as oxygen, these gases being supplied by hoses and 'l Irespectively.

Cooling medium headers 66 are supplied with a suitable cooling liquid byhoses 12, andthe cooling liquid is distributed by the headers to thequench Iblock and the blowpipe heads through tubes 6I and 62,respectively. The cooling liquid used in most instances is water, andafter the liquid cools the heated surface of shaft S, or the blowpipeheads, it falls to tank T of Fig. l, as described previously. From tankT, the water is led to a sewer or other suitable place of dis-` posal bya drain pipe 15. Since some cooling liquid falls into well W, a suitabledrain should also be provided at its lower end.

Should a cooling liquid other than water be used, such as oil, or asodium hydroxide solution, drain pipe and the drain from well W may beconnected with a-suitable recirculating pump and a cooling coil so thatthe liquid may be returned to hoses 12 for further use.

In treating an elongated cylindrical article such as shaft S, afterguide bushings of the proper size are installed and the proportions ofthe combustible mixture adjusted so\ that the heating flames burnproperly, shaft S may be placed in well W and then inserted up throughthe lower guide bushing. Dummy shaft 22, to which cable C has beensecured and which is longer than the distance between drive collar L andlower guide bushing 48, may then be run down through the drive collarand upper guide bushing, and attached to the upper end of the shaft S.Motor M is then started in the correct direction of rotation to runshaft S upwardly until the lower end thereof is aboutto leave the lowerguide bushing, in case hardening is to be started a short distance abovethe lower end of shaft S. Or, if hardening is to begin at the lower endof shaft S,*a second dummy shaft may be attached thereto, or the lowerend of shaft S raised until just above tips 46. In the latter instance,it may prove desirable to reduce the rate of rotation of shaft S untilthe shaft enters the lower guide bushing, although the chamfered upperedge of guide bushing 48 will normally guide the shaft accurately intothe bushing. Otherwise, the motor M is started to rotate the shaft S atthe desired speed, such as between and 100 R. P. M., depending upon thediameter.

Next, the oxygen and acetylene are turned on, and the heating flamesignited by a pilot light or small lighting blowpipe provided for thepurpose. At the same time, the ow of quenching and cooling medium isstarted, and motor M or starts to flow ahead/motor M may be accel-.

. erated to provide the normal rate oi.' traverse,

usually between 4 and 10 inches per minute. Aften a short distance hasbeenv traversed, the shaft `Wil1 be in the position of Fig. 1. y

In case the upper end of the surface to be hardened coincides with theend of the shaft, the relative rate of traverse is increased justbefore'the end of the shaft is reached to prevent overheating thesurface at the end, which otherwise might occur due to the lesser amountof heat conducted from the -end of the shaft. As soon as the heatingames reach the top of the shaft, or the top of the surface portion to behardened. they are turned off, but the quenching liquid is not turnedoff until the uppermost heated zone has been quenched. When the surfaceportion to be hardened terminates below the upper end of the shaft, itmay be desirable to continue application of the quenching jets to apoint above the last zone directly heated, in order to minimize thepossibility of residual heat creeping back down the shaft to reheathardened surface portions and thereby reduce, though not destroy, thehardness imparted to the last zone or zones hardened.

As soon as the upper end of shaft S is reached, the shaft will be in aposition in which it can be replaced by a second shaft to be treated. To

accomplish this, it is necessary only to disconnect shaft S fromdummyshaft 22, lift shaft S from the well W, insert the second shaftinto well W, and then attach the second shaft to dummy shaft 22. Theoperation then proceeds as just described.

It will be understood that the apparatus, although described withrespect to hardening outer surfaces of shafts and the like, may bemodified for hardening the inner surfaces of tubes or the like, such asby utilizing a heating and quenching ldevice adapted to direct heatingflames and quenching jets outwardly instead of inwardly. It will befurther understood that the apparatus of this invention is not limitedto hardening alone, but may be used in welding,`cutting, desurfacing,and the like-in fact, any procedure in which it is desired to heatsuccessive portions of a cylindrical surface of an elongated metalarticle While the article is rotating. It will also be understood thatother changes, in the apparatus may be made which will not depart fromthe spirit and scope of this invention, as defined in the appendedclaims.

What is claimed is:

l. Apparatus for treating a cylindrical surface of a metal articlecomprising means for suspend-Y ing said article from a point at oradjacent the upper end thereof so that the axis of said surface isdisposed substantially vertically and so that said article is relativelyfreely rotatable ,about said axis; a device for treating a limited'vertical portion of said surface; a guiding bushing disposed above anda guiding bushing disposed below and closely adjacent said device, formaintaining ,said article in substantially exact alignment duringtreatment; means for rotating said article about said axis` saidrotating means comprising a rotatable drive collar provided with aplurality of rollers each mounted for rotation about a horizontal axisand engaging said article at spaced circumferential points above saidtreating device; and means for effecting a relative vertical movementbetween said article and said treating device so as to treat successivevertical portions of said surface.

2. Apparatus for treating a cylindrical surface of a metal articlecomprising means for suspending said article from a point at or adjacentthe upper end thereof so that the axis of said surface is disposedsubstantially vertically and so that said article is relatively freelyrotatable about said axis; a device for treating a limited verticalportion of said surface; a guiding bushing disposed above said deviceand a guiding bushing disposed below said device, for maintaining saidarticle in substantially exact alignment duringtreatment; a rotatabledrive collar for rotating said article about said axis, said drivecollar being mounted above said treating device and being provided witha plurality of rollers, each mounted for rotation about a horizontalaxis and vertical movement between said article and said treating deviceso as to treat successive ver-tical portions of said surface.

3. Apparatus for hardening a cylindrical surface of an elongated metalarticle comprising an upright framework; a heating and quenching devicemounted on said framework, said heating and quenching device beingadapted to direct a plurality of high temperature heating flames againsta circumferential zone of said surface and a plurality of quenchingliquid jets against an adjoining circumferential Zone beneath the zoneagainst which said heating flames are d1- rected; means for supportingsaid heating and quenching device near the upper end of said framework;a lower guide bushing for said article and mounted beneath and invertical alignment with said heating and quenching device; an upperguide bushing for said article and mounted above said heating andquenching device in direct vertical alignment with said first guidebushing; a drive collar mounted for rotation about a vertical axis anddisposed adjacent and in vertical alignment with said upper guidebushing, said drive collar being adapted to rotate said article aboutthe axis of said cylindrical surface; means for rotating said drivecollar; and means for suspending said article from the upper end thereofand for lowering said article so as to heat and quench successivecircumferential zones of said article While rotating.

4. Apparatus for hardening a cylindrical sur- -face of an elongatedmetal article as dehned in claim 3, in which said drive collar includesan annular block having a plurality of circumferentially spaced plungersmovable horizontally inwardly towards and outwardly from the axis ofrotation of said collar, a roller mounted for rotation about ahorizontal axis at the inner end of each of said plungers, and la springnormally urging ea'ch of said plungers inwardly.

5. Apparatus for hardening a cylindrical surface of an elongated metalarticle, as defined in claim 3, in which said suspending and loweringmeans includes a cable operatively connected at one end with anadjustable power source for effecting movementof said cable in thedirection of its length, a pulley supported above said drive collar andover which said cable passes, a dummy article connected at its lower endwith the article to be treated and at its upper end with the normallyfree end of said cable, and a swivel joint interposed in said cableabove said dummy article, said swivel joint being adapted to permitrotation of said article by said drive collar while said article isbeing lowered by said cable.

6. In apparatus for hardening a surface of a metal article whichincludes a heating head provided with a row of outlets substantiallyparallel to one side thereof for directing high temperature heatingflames against said surface, a quenching device comprising a blockabutting against the side of said heating head adjacent said row ofoutlets with a section thereof extending past said heating head andtoward said outlets, a plurality of outlets in said section fordirecting jets of quenching uid against said surface, and a cooling huidsupply passage formed in said blockand connecting with said cooling uidoutlets.

7. In apparatus for hardening a surface of a metal article as dened inclaim 6, a quenching device in said cooling fluid outlets are inclinedat an angle away from said heating outlets.

8. Apparatus for hardening a surface of a metal article comprising ablowpipe head provided with a row of holes in the face thereof andadapted to receive tips provided with outlets for directing hightemperature heating dames against said surface; means for supplying saidhead with a combustible mixture of gases, said head being provided withmeans for conveying such combustible mixtures of gases to said holes andtips; a quenching device disposed closely adjacent said head and havinga section extending beyond the face of said head and to a point closelyadjacent the discharge ends of said tips, and outlets in said extendingsection, disposed substantially parallel to said row of tips, fordischarging a cooling medium against 'said surface; means for supplyingsaid quenching device with a. cooling fluid, said device being providedwith a passage for conducting such cooling uid to said outlets; meansfor supporting said article l ROMAN E.' ARNoLDY.

CERTIFICATE OF CORRECTION.

Patent No. 2,510,581. February 9, 1915.

` ROMAN F. ARNOLDY.

It is hereby certified that error appears in the printed specificationof the above numbered patent requiring correction as follows: Page l,second column, line 18, strike out "must be provided" page 5, secondcolumn, line 12, for "of" second occurrence, read or; page 24., secondcolumn, line 51;, for "heat" read' treat 3 page 5, second column, line55, claim Y, after in insert --which; and that the said Letters Patentshould'be read with this correction therein that the same me)r conformto the record of the case in the Patent Office.

signed and sealed this 16th day of March, A. D. 19M.

Y Henry Van Arsdale, (Seal) Acting Commissioner of' Patents.

